Which AI agent memory system is the best?
Asked "Which AI agent memory system is the best?", ChatGPT, Copilot, Gemini, Google AI Mode and Perplexity named 14 distinct names across 5 answers on September 8, 2026, and 5 of them in two or more answers, and all 5 engines agreed on Mem0, the only name every engine named.
Measured acrossChatGPTCopilotGeminiGoogle AI ModePerplexity
5 of 14 names confirmed · named in 2 or more of 5 answers · asked September 8, 2026 · 5 engines
There isn't a single "best" AI agent memory system, as the right choice depends on the specific use case and requirements of the agent.
- 1Mem0named in 5 of 5 answers
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- 2Lettanamed in 5 of 5 answers
- 3Zepnamed in 4 of 5 answers
- 4Cogneenamed in 2 of 5 answers
- 5LangMemnamed in 2 of 5 answers
- 6Zep/Graphitinamed in 1 of 5 answersone answer
- 7MemPalacenamed in 1 of 5 answersone answer
- 8LangChainnamed in 1 of 5 answersone answer
- 9LangGraphnamed in 1 of 5 answersone answer
- 10Markdown Wikinamed in 1 of 5 answersone answer
- 11Mitosis Cortexnamed in 1 of 5 answersone answer
- 12Pineconenamed in 1 of 5 answersone answer
- 13Supermemorynamed in 1 of 5 answersone answer
- 14LlamaIndex Memorynamed in 1 of 5 answersone answer
LOCKED
The full measurement
- The position each of the 5 engines gave all 14 names.
- How many of the 5 answers named each of them.
- 28 sampled observations behind this ranking, and where the engines disagree.
- Fan-out — the query each engine actually searched.
- Every citation, and the sources nobody cited.